<?php
$a = true;
$b = true;

$c = $a < $b;
$c = $a <= $b;
$c = $a > $b;
$c = $a >= $b;
$c = $a <> $b;
$c = $a != $b;
$c = $a == $b;
$c = $a !== $b;
$c = $a === $b;
?>